Thermostatic heat control



Sept. 29, 1931. D. FIRTH 1,825,225

' THERMOSTATIC HEAT CONTROL Filed June 14, 1929 2 Sheets-Sheet l Sept.29, 1931. D. FIRTH 1,825,225

THERMOSTATIC HEAT CONTROL Filed June 14, 1929 2 Sheets-Sheet 2[2YEZ'7/EF J David Jz'rtk,

Q Q 4E" Patented Sept. 29, 1931 UNITED STATES PATENT orncr:

OF FLINT, MICHIGAN, A CORPORATION OF ILLINOIS TEEBIOBTATIC HEAT CONTROLApplication filed June 14, 1929. Serial 1T0. 870,808.

This invention relates to carburetion systems for internal combustionengines and has special reference to the provision of a modulated heatcontrol produced by an in- U terconnection of the exhaust and intakemanifolds.

It is an object of this invention to provide an improved heat controlgoverning the diversion of exhaust gases through a heating jacketassociated withthe intake manifold,

said heat control being adapted to compensate for varying operatingtemperature conditions. It has heretofore been proposed to vary theheating efl'ect on the intake manifold in inverse proportion to theextent of throttle opening, supplying a maximum amount of heat to thejacket under idling conditions of operation, and greatly restricting orentirely cutting oif the supply of heat as the throttle approaches itswide open position, in order to develop the maximum power from a givenengine under such conditions. One method of accomplishing this variationof heat supply is to divert ex-' haust gases through a heating jacketand supplying a diversion valve interconnected in step with the throttleso that the diversion valve shunts the whole supply of heating fluidthrough the jacket when the throttle is in idling position. The presentinvention relates to improved and simplified means for varying therelationship between the diversion valve and the throttle to vary theprimitive position of one valve relative to the other to vary the heatsupply for idling and to decrease the heat supply'earlier relative tothe throttle opening, in order to compensate for varying temperatureconditions under which the engine is operated at different seasons ofthe year and diiferent climates.

It is'another object of this invention to provide a compact andsimplified structure, readily manu actured and assembled andtrouble-proof in service.

Other and further importantobjects of this invention will be apparentfrom the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings andhereinafter more fullydescribed.

On the drawings:

Figure 1 is a sideelevation of an engine manifolding system withparts-broken away to show features of this invention.

Figure 2 is a section on the line 11-11 of Figure 1.

Figures 3, 4 and 5, respectively, represent the cold, warm and hotadjusted positions of the valve of this invention when the valve is inidling position.

As shown on the drawings:

An exhaust manifold 10 is shown as having four exhaust collecting branchflanges 11 with an enlarged chamber 12 forming upper and lower segmentalportions 13 of a cylinder disposed crosswise of the manifold. As shown,this chamber is midway of the length of the manifold in which case halfof the exhaust gases from the engine will pass therethrough; although itwill be evident that for the purposes of this invention the chambermight be located as to control a larger or smaller proportion of theexhaust gases by shifting its position towards or away from the exhaustoutlet 14;.

An intake manifold 15 fed by a central riser 16 is positioned beneaththe exhaust manifold and a carbureter 17 is applied to the lower end ofthe riser 16. As shown in the drawings, a throttle valve 18 in a shaft19, is mounted on the riser instead of in the carbureter because ofcertain advantages of such an arrangement, although it is to beunderstood that the present invention is not limited to such anarrangement.

The riser 16 is provided with .an outer casing 20 defining an annularjacket space divided by diametrically opposite partitions 21 into aU-type of jacket, the two semicylindrical jacket spaces 22 and 23 beingunited beneath the lower edge of the partitions, which do not extend thefull length of the jacket. A jacket 24 and partitions 25, associatedwith the T portion of the intake manifold, form upward continuations 26and- 27 of the spaces 22 and 23, and ports 28 and 29 in the bottom ofthe exhaust manifold chamber 12, on either side of the lower cylindricalsegment 13, communicate with the jacket spaces 26 and 27.

An exhaust control valve 30 is secured on a shaft 31 axially mountedrelative to the cylindrical segments 13 in the chamber 12. The frontopening of the chamber 12 in Figure 1 is closed by a cover 32. A lever34 associated with the shaft 31 is linked by a rod 35 to an extra arm 36on a throttle control lever on the throttle shaft 19. This arrangementcauses the exhaust control valve to be operated in unison with thethrottle valve, the exhaust control valve diverting all the exhaustgases through the heating jacket when the throttle is closed;

the valve opening in step with the throttle opening movement.

In order to modify the proportioning of the exhaust gas flow to thethrottle opening, or more specifically to vary the primitive openingposition of the exhaust control valve relative to the throttle opening,I rovide two segments 37 of a cylinder enve oping the exhaust controlvalve, these segments being formed as a sheet metal stamping withoutstanding flanges 38, which cooperate with the segments 13 formingvalve seats in the chamber, while the cylindrical segments 37 cooperatewith the tips of the exhaust control valve 30. These segments 37 arecarried by a sleeve 33 surrounding the shaft passing through the cover,a lever 39 secured thereon being linked by a rod 40 to a lever 41pivoted at 42 and connected at 43 to a link 44 operated by athermostatically responsive device 45. As shown, this device comprisesan expansible corrugated cylinder containing a volatile liquid, thecylinder being mounted in a chamber 46 in the engine cooling radiator47.

The operation:

The exhaust control valve 30 is shown in I the position corresponding toan idling position of the throttle, both rotating counterclockwise asthe throttle opens. In Figure 1 and Figure 3 the heat modifying segments37 are shown for the cold weather position wherein the thermostaticdevice is collapsed in the position shown in Fi re 1. A rise in thetemperature of the thermostatic device causes expansion thereof whichimposes a pull on the rod 40 which rotates the segments 37 clockwisethrough the position shown in Figure 4 to that shown in Figure 5, thelatter corresponding to extreme operating temperature where a fulldiversion of exhaust gases is not required even for idling operation.The width and position of the chamber segments 13 is chosen tocorrespond with the fullrange of movement of the heat modulating segmentflanges 38, while the width of the segments 37 is so chosen as todetermine the temperature at which full diversion of the exhaust gasesbegins to be reduced by the actual opening of the valve 30 relative tothe edge of segments 37 as indicated in Figure 4. Expressed in anotherway, the width of the segments 37 determines how far the throttle valveopens for cold conditions before the division of exhaust gases throughthe heating jacket is reduced by a partial opening of the exhaust may bevaried through a wide range without departing from the principles ofthis lnvention, and I therefore do not purpose hunting the patentgranted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. A manifolding system for internal combustion engines, including anexhaust manifold, an intake manifold and a throttle valve for saidintake manifold, a control valve in said exhaust manifold, a heatingjacket surrounding a portion of the intake manifold and having supplyand return ducts opening into said exhaust manifold on opposite sides ofsaid control valve therein, linkage connecting said throttle valve andsaid control valve whereby said valves operate in unison, and meanscooperating with said exhaust control valve for varying the primitiveopening position thereof relative to the throttle valve.

2. A manifolding system for internal combustion engines, including anexhaust manifold, an intake manifold and a throttle valve for saidintake manifold, a control valve in said exhaust manifold, a heatingjacket surrounding a portion of the intake manifold and having supplyand return ducts opening into said exhaust manifold on opposite sides ofsaid control valve therein, linkage connecting said throttle valve andsaid control valve whereby said valves operate in unison, and a heatmodulating valve cooperating with said exhaust control valve to vary theeffective opening position thereof relative to the throttle valve.

3. A manifolding system for internal combustion engines, including anexhaust manifold, an intake manifold and a throttle valve for saidintake manifold, a control valve in said exhaust manifold, a heatingjacket surrounding a portion of the intake manifold and having supplyand return ducts opening into said exhaust manifold on opposite sides ofsaid control valve therein, linkage connecting said throttle valve andsaid control valve whereby said valves operate in unison, a heatmodulating valve cooperating with said exhaust control valve to vary theeffective opening position thereof relative to the throttle valve, andthermostatic means for operating said modulating valve.

4. In combination with the exhaust and intake manifolds of an internalcombustion engine, an exhaust control valve in said exhaust manifold, aheating jacket associated with said intake manifold and having supplyand return connections opening into said exhaust manifolds on oppositesides of said control valve, means for operating said exhaust controlvalve to divert varyin proportions of exhaust gases through sai heatingjacket, and means cooperating with said exhaust control valve forvarying the effective initial opening position thereof.

5. In combination with the exhaust and intake manifolds of an internalcombustion engine, an exhaust control valve in said exhaust manifold, aheating jacket associated with said intake manifold and having supplyand return connections opening into said exhaust manifolds on opposite,sides of said control valve, means for operating said exhaust controlvalve to divert varying pro portions of exhaust gases throughsaidheating jacket, means cooperating with said exhaust control valvefor varying the effective initial opening position thereof, andthermostatic means for operating said last mentioned means.

6. In combination with the exhaust and intake manifolds of an internalcombustion engine, an exhaust control valve in sa1 d exhaust manifold, aheating jacket associated wtih said intake manifold and having supplyand return connections opemn into said exhaust manifolds on opposite s1es of said control valve, means for operating sald exhaust control valveto divert varying proportions of exhaust gases through said heat ingjacket, and a heat modulatmg valve cooperating with said exhaust controlvalve to vary the effective opening position thereof relative to thethrottle valve.

7. In combination with the exhaust and intake manifolds of an internalcombustion engine, an exhaust control yalve in said exhaust manifold, aheating acket associated with said intake manifold and having supply andreturn connections opening into sa d exhaust manifolds on opposite sidesof said control valve, means for operating said exhaust control valve todivert varying proportions of exhaust gases through said heating jacket,a heat modulating valve cooperating with said exhaust control valve tovary the effective opening position thereof relative to the throttlevalve, and thermostatic means for operating said modulating valve.

8. In combination with the exhaust manifold and carburetion system of aninternal combustion engine, a heating jacket for said carburetion systemhaving supply and return connections to said exhaust manifold, a controlvalve in said exhaust manifold for diverting varying amounts of exhaustgases through said heating jacket, means for operating said exhaustcontrol valve to divert varying proportions of exhaust gases throughsaid heating jacket, and means cooperating with said exhaust controlvalve for varying the effective initial opening position thereof.

9. In combination with the exhaust manifold and carburetion system of aninternal combustion engine, a heating jacket for said carburetion systemhaving supply and return connections to said exhaust manifold, a controlvalve in said exhaust manifold for diverting varying amounts of exhaustgases through said heating jacket, means for operating said exhaustcontrol valve to divert Varying proportions of exhaust gases throughsaid heating jacket, means cooperating with said exhaust control valvefor varying the effective initial opening position thereof, andthermostatic means for operating said last mentioned means.

10. In combination with the exhaust manifold and carburetion system ofan internal combustion engine, a heating jacket for said carburetionsystem having supply and return connections to said exhaust manifold, acontrol valve in said exhaust manifold for divertin varying amounts'ofexhaust gases through said heating jacket, means for operating saidexhaust control valve to divert varying proportions of exhaust gasesthrough said heating jacket, and a heat modulating valve cooperatingwith said exhaust control valve to vary the effective opening positionthereof relative to the throttle valve.

11. In combination with the exhaust manifold and carburetion system ofan internal combustion engine, a heating jacket for said carburetionsystem having supply and return connections to said exhaust manifold, acontrol valve in said exhaust manifold for diverting varying amounts ofexhaust gases through said heating jacket, means for operating saidexhaust control valve to divert varyin proportions of exhaust gasesthrong said heating jacket, a heat modulating valve cooperating withsaid exhaust control valve to vary the effective opening positionthereof relative to the throttle valve, and thermostatic means foroperating said modulating valve.

In testimony whereof I have hereunto subscribed my name at Flint,Genesee County,

